Our Calcium & Vitamin D3 formula combines two ingredients that are essential separately, but even more effective when combined. Ask any physician, naturopath or health care provider and they'll tell you that for many of us, increased risk of bone loss is simply a byproduct of aging. Ensuring your body has plenty of calcium can prevent not only fracture, osteoporosis, and even loss of teeth, but you'll help your body maintain good muscle contraction, blood vessel constriction and relaxation, secretion of hormones and enzymes, and even some nervous system functions. Chicken eggshell powder, not surprisingly, has a very high content of calcium. What you may not know is eggshell powder may be more soluble and absorbable in the stomach when compared to synthetic Calcium Carbonate, which is used in many vitamins and supplements brands. (We also prefer the idea of sourcing our Calcium from a substance such as egg shells rather than, well, rocks.) Our formula also includes valuable Vitamin D3 which helps in the absorption of Calcium to increase bone mineral density. Vitamin D3 also plays an important role in the central nervous system; it's involved in the metabolism of neurotransmitters such as acetylcholine (healthy development of memory), dopamine (pleasure hormone) and serotonin (happy hormone). And who doesn't want more of those? Even beyond these basic quality of life attributes, Vitamin D also helps maintain normal blood levels of Calcium for healthy bones and teeth, and phosphorus. If you're female and over 40, it's also likely your doctor or health care provider has made you aware of the role Vitamin D—or lack of vitamin D—can play in depression, seasonal affective disorder and premenstrual syndrome.